CHEM 1021 Lecture Notes - Lecture 29: Disulfur Dichloride, Carbon Tetrachloride, Carbon Disulfide
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Example 3: putting things together in one problem. Energy: ability to transfer heat and/or do work. 1 cal: 4. 184 (this will be given on the exam if needed) Law of conservation of energy: energy cannot be created or destroyed, but it can be converted from one form to another. Potential energy: energy that is stored to be used later. Work: force applied over a distance, motion in one direction. Heat: transfer of energy between two (or more) things due to a difference, random motion. Temperature: measure of how hot or cold something is relative to a standard. Sign convention: very important in energy calculations: defi(cid:374)ed fro(cid:373) the s(cid:455)ste(cid:373)"s perspe(cid:272)tive (+) gains heat, work is done on the system (-) loses heat, work is done by the system (q) means heat (w) means work. If the water was freezing, it would be exothermic. Hot and cold packs- heat of solution. (these are both physical changes)
